public class e4_7{
  public static void main(String args[]){
    Battery nanfu = new Battery(100);
  System.out.println("南孚电池的储蓄量是:"+nanfu.electricityAmount);
Radio radio=new Radio();
System.out.println("收音机开始使用南孚电池");
radio.openRadio(nanfu);
System.out.println("目前南孚电池的储电量是:"+nanfu.electricityAmount);
  }
}
